Haven't tried that before, but I would have to think that if one of those queries is a Totals query, then you absolutely cannot update records returned from running it by using a form.
In that particular case, the reasoning is straightforward:
Access would have to 'reverse-engineer' your Totals query to write to multiple records in the underlying table(s) for the single record that you're working on in the form.
Although the functionality for Referential Integrity invokes the use of multiple/cascading updates for a single field, that doesn't apply to a whole record, which may consist of multiple fields from multiple tables.
What you are attempting suggests that your table structure hasn't been normalized. Why do you need the values returned from stacked or combined queries to be updatable (presuming that is the case)?
HTH,
John